Stockholders' deficit - Warrants Outstanding (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Stock options
Beginning balance, warrants	2,566,101,248	97,799,908
Beginning balance, warrants exercise price	$ 0.0044700	$ 0.0910
Adjustment due to price protection, shares	152,017,272,726	2,456,534,397
Adjustment due to price protection, price	$ 0.0000324	$ 0.0020400
Warrants Granted, shares	133,333,332	27,700,652
Warrants granted, price	$ 0.0015000	$ 0.1177
Warrants Forfeited, shares	(2,366,666)	(15,633,709)
Warrants Forfeited, price	$ 0.0300000	$ 0.0300000
Warrant Exercised, shares	(224,388,247)
Warrants Exercised, price	$ 0.0004000
Granted in terms of debt extinguishment, shares	326,286,847
Granted in terms of debt extinguishment, price	$ 0.0006750
Cancelled as part of debt extinguishment, shares	(154,300,675,861)
Cancelled as part of debt extinguishment, price	$ 0.0000324
Ending Balance, warrants	515,561,379	2,566,101,248
Ending Balance, warrants exercise price	$ 0.0131892	$ 0.0044700